Comparison of the High Pressure Structures of Spinel Single Crystals with Composition Mg_<0.4>Al_<2.4>O_4 and ZnCr_2S_4
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The present study deals with single crystal structure investigations of Mg <SUB>0. 4</SUB>Al<SUB>2. 4</SUB>O<SUB>4</SUB> and ZnCr<SUB>2</SUB>S<SUB>4</SUB> by means of X ray scattering. The compressibility of the oxide substance is very small, whereas the structural changes are surprisingly high. In contrast, the compressibility of the thiospinel is 3 times higher, but the structural changes are very small. The transition to a non-detectable high pressure phase of Mg<SUB>0. 4</SUB>Al<SUB>2. 4</SUB>O<SUB>4</SUB> turns out to be reversible considering the existence of a spinel single crystal, but not reversible concerning the values of the lattice constant and the positional parameter of the oxygen anion. This can be explained by pressure induced disordering of the cations, which is preserved on abrupt pressure decrease.
- The Review of High Pressure Science and Technology
The Review of High Pressure Science and Technology 7, 49-54, 1998
The Japan Society of High Pressure Science and Technology